* combined with the permissions of all groups that a given user is listed
* in in the user_groups table.
*
+ * Note: Don't set $wgGroupPermissions = array(); unless you know what you're
+ * doing! This will wipe all permissions, and may mean that your users are
+ * unable to perform certain essential tasks or access new functionality
+ * when new permissions are introduced and default grants established.
+ *
* Functionality to make pages inaccessible has not been extensively tested
* for security. Use at your own risk!
*